diff --git a/cli/cmdlineparser.cpp b/cli/cmdlineparser.cpp
index 92f4c6cef3b..7c18e428023 100644
--- a/cli/cmdlineparser.cpp
+++ b/cli/cmdlineparser.cpp
@@ -269,10 +269,10 @@ bool CmdLineParser::fillSettingsFromArgs(int argc, const char* const argv[])
         {
             auto it = filesResolved.begin();
             while (it != filesResolved.end()) {
-                const std::string& name = it->path();
+                const std::string& absname = Path::getAbsoluteFilePath(it->spath());
                 // TODO: log if duplicated files were dropped
                 filesResolved.erase(std::remove_if(std::next(it), filesResolved.end(), [&](const FileWithDetails& entry) {
-                    return entry.path() == name;
+                    return Path::getAbsoluteFilePath(entry.spath()) == absname;
                 }), filesResolved.end());
                 ++it;
             }
diff --git a/test/cli/more-projects_test.py b/test/cli/more-projects_test.py
index 03dc00ed0f3..73d738d9cfb 100644
--- a/test/cli/more-projects_test.py
+++ b/test/cli/more-projects_test.py
@@ -657,7 +657,7 @@ def test_project_file_duplicate_2(tmpdir):
     assert stderr == ''
 
 
-def test_project_file_duplicate_3(tmpdir):
+def test_project_file_duplicate_3(tmpdir):  # #12834
     test_file_a = os.path.join(tmpdir, 'a.c')
     with open(test_file_a, 'wt'):
         pass
@@ -687,33 +687,18 @@ def test_project_file_duplicate_3(tmpdir):
 </project>""".format(in_file_a, in_file_b, in_file_c, in_file_d, in_file_e, in_file_f, tmpdir))
 
     args = ['--project={}'.format(project_file)]
-    args.append('-j1') # TODO: remove when fixed
 
     exitcode, stdout, stderr = cppcheck(args, cwd=tmpdir)
     assert exitcode == 0
     lines = stdout.splitlines()
-    # TODO: only a single file should be checked
-    if sys.platform == 'win32':
-        assert lines == [
-            'Checking {} ...'.format(test_file_a),
-            '1/3 files checked 33% done',
-            'Checking {} ...'.format(test_file_a),
-            '2/3 files checked 66% done',
-            'Checking {} ...'.format(test_file_a),
-            '3/3 files checked 100% done'
-        ]
-    else:
-        assert lines == [
-            'Checking {} ...'.format(test_file_a),
-            '1/2 files checked 50% done',
-            'Checking {} ...'.format(test_file_a),
-            '2/2 files checked 100% done'
-        ]
+    assert lines == [
+        'Checking {} ...'.format(test_file_a)
+    ]
     assert stderr == ''
 
 
 @pytest.mark.skipif(sys.platform != 'win32', reason="requires Windows")
-def test_project_file_duplicate_4(tmpdir):
+def test_project_file_duplicate_4(tmpdir):  # #12834
     test_file_a = os.path.join(tmpdir, 'a.c')
     with open(test_file_a, 'wt'):
         pass
@@ -756,19 +741,12 @@ def test_project_file_duplicate_4(tmpdir):
                      args2[0], args2[1], args2[2], args2[3], args2[4], args2[5], args2[6]))
 
     args = ['--project={}'.format(project_file)]
-    args.append('-j1') # TODO: remove when fixed
 
     exitcode, stdout, stderr = cppcheck(args, cwd=tmpdir)
     assert exitcode == 0
     lines = stdout.splitlines()
-    # TODO: only a single file should be checked
     assert lines == [
-        'Checking {} ...'.format(test_file_a),
-        '1/3 files checked 33% done',
-        'Checking {} ...'.format(test_file_a),
-        '2/3 files checked 66% done',
-        'Checking {} ...'.format(test_file_a),
-        '3/3 files checked 100% done'
+        'Checking {} ...'.format(test_file_a)
     ]
     assert stderr == ''
 
diff --git a/test/cli/other_test.py b/test/cli/other_test.py
index c4ae2fab5cf..744a68aac60 100644
--- a/test/cli/other_test.py
+++ b/test/cli/other_test.py
@@ -1216,7 +1216,7 @@ def test_file_duplicate_2(tmpdir):
     assert stderr == ''
 
 
-def test_file_duplicate_3(tmpdir):
+def test_file_duplicate_3(tmpdir):  # #12834
     test_file_a = os.path.join(tmpdir, 'a.c')
     with open(test_file_a, 'wt'):
         pass
@@ -1230,43 +1230,18 @@ def test_file_duplicate_3(tmpdir):
     in_file_f = os.path.join(tmpdir, 'dummy', '..', 'a.c')
 
     args = [in_file_a, in_file_b, in_file_c, in_file_d, in_file_e, in_file_f, str(tmpdir)]
-    args.append('-j1') # TODO: remove when fixed
 
     exitcode, stdout, stderr = cppcheck(args, cwd=tmpdir)
     assert exitcode == 0, stdout if stdout else stderr
     lines = stdout.splitlines()
-    # TODO: only a single file should be checked
-    if sys.platform == 'win32':
-        assert lines == [
-            'Checking {} ...'.format('a.c'),
-            '1/6 files checked 16% done',
-            'Checking {} ...'.format('a.c'),
-            '2/6 files checked 33% done',
-            'Checking {} ...'.format('a.c'),
-            '3/6 files checked 50% done',
-            'Checking {} ...'.format(test_file_a),
-            '4/6 files checked 66% done',
-            'Checking {} ...'.format(test_file_a),
-            '5/6 files checked 83% done',
-            'Checking {} ...'.format(test_file_a),
-            '6/6 files checked 100% done'
-        ]
-    else:
-        assert lines == [
-            'Checking {} ...'.format('a.c'),
-            '1/4 files checked 25% done',
-            'Checking {} ...'.format('a.c'),
-            '2/4 files checked 50% done',
-            'Checking {} ...'.format(test_file_a),
-            '3/4 files checked 75% done',
-            'Checking {} ...'.format(test_file_a),
-            '4/4 files checked 100% done'
-        ]
+    assert lines == [
+        'Checking {} ...'.format('a.c')
+    ]
     assert stderr == ''
 
 
 @pytest.mark.skipif(sys.platform != 'win32', reason="requires Windows")
-def test_file_duplicate_4(tmpdir):
+def test_file_duplicate_4(tmpdir):  # #12834
     test_file_a = os.path.join(tmpdir, 'a.c')
     with open(test_file_a, 'wt'):
         pass
@@ -1284,25 +1259,12 @@ def test_file_duplicate_4(tmpdir):
     for a in args1:
         args2.append(a.replace('\\', '/'))
     args = args1 + args2
-    args.append('-j1') # TODO: remove when fixed
 
     exitcode, stdout, stderr = cppcheck(args, cwd=tmpdir)
     assert exitcode == 0, stdout if stdout else stderr
     lines = stdout.splitlines()
-    # TODO: only a single file should be checked
     assert lines == [
-        'Checking {} ...'.format('a.c'),
-        '1/6 files checked 16% done',
-        'Checking {} ...'.format('a.c'),
-        '2/6 files checked 33% done',
-        'Checking {} ...'.format('a.c'),
-        '3/6 files checked 50% done',
-        'Checking {} ...'.format(test_file_a),
-        '4/6 files checked 66% done',
-        'Checking {} ...'.format(test_file_a),
-        '5/6 files checked 83% done',
-        'Checking {} ...'.format(test_file_a),
-        '6/6 files checked 100% done'
+        'Checking {} ...'.format('a.c')
     ]
     assert stderr == ''